Terms of the transaction weren’t disclosed in a statement Tuesday announcing the deal. The investment will help Green Street expand research on real estate investment trusts and analytics for the private property market, said Craig Leupold, president of the Newport Beach, California-based company.

Green Street was founded in 1985 by Jon Fosheim and Mike Kirby, currently the firm’s chairman. The company was known mainly for research on REITs. In the past few years, it has expanded in commercial-property data, including indexes to track real estate prices and private-equity fund flows.

Commercial real estate is “a growing industry and one that has increasingly become more institutional in nature,” Leupold said in a telephone interview. “That’s driven an increased need for research and analysis to help institutions make good capital-allocation decisions. We’re sitting in a good place, and Golden Gate saw that opportunity as well.”

Green Street, which also provides advisory and consulting services, has more than 90 employees. All 12 of its managing directors will continue in their current roles, the companies said. Golden Gate, which has more than $12 billion under management, invests mainly in technology, retail, industrial and business and financial services, according to its website.